22251-34-9Relevant articles and documents
Acetal Metathesis: Mechanistic Insight
Miller, Stephen A.,Pemba, Alexander G.
, p. 1971 - 1976 (2019)
The origins and recent applications of acetal metathesis are discussed in the context of synthesizing polyacetals via acetal metathesis polymerization (AMP). A kinetic study of the acid-catalyzed acetal metathesis reaction suggests the rate = k [H + ][acetal] 2, with MeOCH 2 OMe and EtOCH 2 OEt interchanging to yield MeOCH 2 OEt, achieving the statistical 1:2:1 equilibrium distribution in 4 hours at 80 °C and in 1 hour at 90 °C. Upon heating 1,10-decanediol and diethoxymethane, polydecylene acetal is formed with sequential distillation of ethanol, followed by diethoxymethane. A full mechanism for this polymerization is proposed, which begins with a transacetalization sequence to convert the diol into a bisacetal, followed by acetal metathesis to yield a high-molecular-weight polymer.
Method for preparing diethoxymethane by supported heteropolyacid catalyst
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Paragraph 0022; 0023, (2017/03/17)
The invention relates to a method for preparing diethoxymethane, in particular to a method for for preparing diethoxymethane by a supported heteropolyacid catalyst. According to the method, dimethoxymethane and ethanol are taken as raw materials, liquid acid and supported liquid acid are taken as catalysts, the preparation method of the supported heteropolyacid catalyst, for example 33% of H3PW12O40/SiO2, comprises the following steps that a phosphotungstic acid aqueous solution with the concentration of 33% by mass is used, SiO2 is taken as a carrier, the impregnation liquid volume is the approximate to the pore volume, a catalyst sample is obtained after the phosphotungstic acid aqueous solution and the SiO2 are mixed uniformly and stood at the normal temperature by 10h, the sample is dried at the temperature of 120 DEG C, and calcination is performed at the temperature of 350 DEG C to obtain the 33% of H3PW12O40/SiO2 catalyst by the mass is prepared. According to the method, the product is relatively simple, the selectivity is high, and the method has an excellent application prospect. The raw materials required by the method are easy to obtain, the whole process operation is simple, at the same time, the method doesn't produce any chemical substances polluting the environment, and the method belongs to the environment-friendly technology route.
Method for preparing ethoxy methoxy methane using molecular sieves with different topological structures
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Paragraph 0018; 0019; 0020; 0021; 0022; 0023; 0024-0036, (2017/02/28)
The invention discloses a method for preparing ethoxy methoxy methane using molecular sieves with different topological structures and relates to a method for preparing ethoxy methoxy methane. The ethoxy methoxy methane is prepared by taking dimethoxymethane and ethanol as raw materials and molecular sieves with different topological structures as catalysts at certain temperature and pressure; the silicon-aluminum atom ratio Si/Al in the molecular sieve catalysts with different topological structures is 3-100; the molecular sieves with different topological structures refer to one or more of hydrogen type MCM-22 molecular sieve, hydrogen type ZSM-35 molecular sieve, hydrogen type ZSM-5 molecular sieve, hydrogen type mordenite, hydrogen type Y zeolite and hydrogen type Beta molecular sieve; and the structure types of the molecular sieve catalysts with different topological structures are at least one of MWW, FER, MFI, MOR, FAU and BEA. The method disclosed by the invention has the advantages of relatively single product, high selectivity, cheap and easily available raw materials, easiness in operation of whole process and no production of chemical substances polluting environment and is an environment-friendly technological path.
